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<a name="Debugging-Output"></a>
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Next: <a href="Other-Misc-Settings.html#Other-Misc-Settings" accesskey="n" rel="next">Other Misc Settings</a>, Previous: <a href="Messages_002fWarnings.html#Messages_002fWarnings" accesskey="p" rel="prev">Messages/Warnings</a>, Up: <a href="Controlling-GDB.html#Controlling-GDB" accesskey="u" rel="up">Controlling GDB</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Optional-Messages-about-Internal-Happenings"></a>
<h3 class="section">22.9 Optional Messages about Internal Happenings</h3>
<a name="index-optional-debugging-messages"></a>

<p><small>GDB</small> has commands that enable optional debugging messages from
various <small>GDB</small> subsystems; normally these commands are of
interest to <small>GDB</small> maintainers, or when reporting a bug.  This
section documents those commands.
</p>
<dl compact="compact">
<dd><a name="index-set-exec_002ddone_002ddisplay"></a>
</dd>
<dt><code>set exec-done-display</code></dt>
<dd><p>Turns on or off the notification of asynchronous commands&rsquo;
completion.  When on, <small>GDB</small> will print a message when an
asynchronous command finishes its execution.  The default is off.
<a name="index-show-exec_002ddone_002ddisplay"></a>
</p></dd>
<dt><code>show exec-done-display</code></dt>
<dd><p>Displays the current setting of asynchronous command completion
notification.
<a name="index-set-debug"></a>
<a name="index-ARM-AArch64"></a>
</p></dd>
<dt><code>set debug aarch64</code></dt>
<dd><p>Turns on or off display of debugging messages related to ARM AArch64.
The default is off.
<a name="index-show-debug"></a>
</p></dd>
<dt><code>show debug aarch64</code></dt>
<dd><p>Displays the current state of displaying debugging messages related to
ARM AArch64.
<a name="index-gdbarch-debugging-info"></a>
<a name="index-architecture-debugging-info"></a>
</p></dd>
<dt><code>set debug arch</code></dt>
<dd><p>Turns on or off display of gdbarch debugging info.  The default is off
</p></dd>
<dt><code>show debug arch</code></dt>
<dd><p>Displays the current state of displaying gdbarch debugging info.
</p></dd>
<dt><code>set debug aix-solib</code></dt>
<dd><a name="index-AIX-shared-library-debugging"></a>
<p>Control display of debugging messages from the AIX shared library
support module.  The default is off.
</p></dd>
<dt><code>show debug aix-thread</code></dt>
<dd><p>Show the current state of displaying AIX shared library debugging messages.
</p></dd>
<dt><code>set debug aix-thread</code></dt>
<dd><a name="index-AIX-threads"></a>
<p>Display debugging messages about inner workings of the AIX thread
module.
</p></dd>
<dt><code>show debug aix-thread</code></dt>
<dd><p>Show the current state of AIX thread debugging info display.
</p></dd>
<dt><code>set debug check-physname</code></dt>
<dd><a name="index-physname"></a>
<p>Check the results of the &ldquo;physname&rdquo; computation.  When reading DWARF
debugging information for C<tt>++</tt>, <small>GDB</small> attempts to compute
each entity&rsquo;s name.  <small>GDB</small> can do this computation in two
different ways, depending on exactly what information is present.
When enabled, this setting causes <small>GDB</small> to compute the names
both ways and display any discrepancies.
</p></dd>
<dt><code>show debug check-physname</code></dt>
<dd><p>Show the current state of &ldquo;physname&rdquo; checking.
</p></dd>
<dt><code>set debug coff-pe-read</code></dt>
<dd><a name="index-COFF_002fPE-exported-symbols"></a>
<p>Control display of debugging messages related to reading of COFF/PE
exported symbols.  The default is off.
</p></dd>
<dt><code>show debug coff-pe-read</code></dt>
<dd><p>Displays the current state of displaying debugging messages related to
reading of COFF/PE exported symbols.
</p></dd>
<dt><code>set debug dwarf-die</code></dt>
<dd><a name="index-DWARF-DIEs"></a>
<p>Dump DWARF DIEs after they are read in.
The value is the number of nesting levels to print.
A value of zero turns off the display.
</p></dd>
<dt><code>show debug dwarf-die</code></dt>
<dd><p>Show the current state of DWARF DIE debugging.
</p></dd>
<dt><code>set debug dwarf-line</code></dt>
<dd><a name="index-DWARF-Line-Tables"></a>
<p>Turns on or off display of debugging messages related to reading
DWARF line tables.  The default is 0 (off).
A value of 1 provides basic information.
A value greater than 1 provides more verbose information.
</p></dd>
<dt><code>show debug dwarf-line</code></dt>
<dd><p>Show the current state of DWARF line table debugging.
</p></dd>
<dt><code>set debug dwarf-read</code></dt>
<dd><a name="index-DWARF-Reading"></a>
<p>Turns on or off display of debugging messages related to reading
DWARF debug info.  The default is 0 (off).
A value of 1 provides basic information.
A value greater than 1 provides more verbose information.
</p></dd>
<dt><code>show debug dwarf-read</code></dt>
<dd><p>Show the current state of DWARF reader debugging.
</p></dd>
<dt><code>set debug displaced</code></dt>
<dd><a name="index-displaced-stepping-debugging-info"></a>
<p>Turns on or off display of <small>GDB</small> debugging info for the
displaced stepping support.  The default is off.
</p></dd>
<dt><code>show debug displaced</code></dt>
<dd><p>Displays the current state of displaying <small>GDB</small> debugging info
related to displaced stepping.
</p></dd>
<dt><code>set debug event</code></dt>
<dd><a name="index-event-debugging-info"></a>
<p>Turns on or off display of <small>GDB</small> event debugging info.  The
default is off.
</p></dd>
<dt><code>show debug event</code></dt>
<dd><p>Displays the current state of displaying <small>GDB</small> event debugging
info.
</p></dd>
<dt><code>set debug expression</code></dt>
<dd><a name="index-expression-debugging-info"></a>
<p>Turns on or off display of debugging info about <small>GDB</small>
expression parsing.  The default is off.
</p></dd>
<dt><code>show debug expression</code></dt>
<dd><p>Displays the current state of displaying debugging info about
<small>GDB</small> expression parsing.
</p></dd>
<dt><code>set debug fbsd-lwp</code></dt>
<dd><a name="index-FreeBSD-LWP-debug-messages"></a>
<p>Turns on or off debugging messages from the FreeBSD LWP debug support.
</p></dd>
<dt><code>show debug fbsd-lwp</code></dt>
<dd><p>Show the current state of FreeBSD LWP debugging messages.
</p></dd>
<dt><code>set debug frame</code></dt>
<dd><a name="index-frame-debugging-info"></a>
<p>Turns on or off display of <small>GDB</small> frame debugging info.  The
default is off.
</p></dd>
<dt><code>show debug frame</code></dt>
<dd><p>Displays the current state of displaying <small>GDB</small> frame debugging
info.
</p></dd>
<dt><code>set debug gnu-nat</code></dt>
<dd><a name="index-GNU_002fHurd-debug-messages"></a>
<p>Turn on or off debugging messages from the <small>GNU</small>/Hurd debug support.
</p></dd>
<dt><code>show debug gnu-nat</code></dt>
<dd><p>Show the current state of <small>GNU</small>/Hurd debugging messages.
</p></dd>
<dt><code>set debug infrun</code></dt>
<dd><a name="index-inferior-debugging-info"></a>
<p>Turns on or off display of <small>GDB</small> debugging info for running the inferior.
The default is off.  <samp>infrun.c</samp> contains GDB&rsquo;s runtime state machine used 
for implementing operations such as single-stepping the inferior.
</p></dd>
<dt><code>show debug infrun</code></dt>
<dd><p>Displays the current state of <small>GDB</small> inferior debugging.
</p></dd>
<dt><code>set debug jit</code></dt>
<dd><a name="index-just_002din_002dtime-compilation_002c-debugging-messages"></a>
<p>Turn on or off debugging messages from JIT debug support.
</p></dd>
<dt><code>show debug jit</code></dt>
<dd><p>Displays the current state of <small>GDB</small> JIT debugging.
</p></dd>
<dt><code>set debug lin-lwp</code></dt>
<dd><a name="index-GNU_002fLinux-LWP-debug-messages"></a>
<a name="index-Linux-lightweight-processes"></a>
<p>Turn on or off debugging messages from the Linux LWP debug support.
</p></dd>
<dt><code>show debug lin-lwp</code></dt>
<dd><p>Show the current state of Linux LWP debugging messages.
</p></dd>
<dt><code>set debug linux-namespaces</code></dt>
<dd><a name="index-GNU_002fLinux-namespaces-debug-messages"></a>
<p>Turn on or off debugging messages from the Linux namespaces debug support.
</p></dd>
<dt><code>show debug linux-namespaces</code></dt>
<dd><p>Show the current state of Linux namespaces debugging messages.
</p></dd>
<dt><code>set debug mach-o</code></dt>
<dd><a name="index-Mach_002dO-symbols-processing"></a>
<p>Control display of debugging messages related to Mach-O symbols
processing.  The default is off.
</p></dd>
<dt><code>show debug mach-o</code></dt>
<dd><p>Displays the current state of displaying debugging messages related to
reading of COFF/PE exported symbols.
</p></dd>
<dt><code>set debug notification</code></dt>
<dd><a name="index-remote-async-notification-debugging-info"></a>
<p>Turn on or off debugging messages about remote async notification.
The default is off.
</p></dd>
<dt><code>show debug notification</code></dt>
<dd><p>Displays the current state of remote async notification debugging messages.
</p></dd>
<dt><code>set debug observer</code></dt>
<dd><a name="index-observer-debugging-info"></a>
<p>Turns on or off display of <small>GDB</small> observer debugging.  This
includes info such as the notification of observable events.
</p></dd>
<dt><code>show debug observer</code></dt>
<dd><p>Displays the current state of observer debugging.
</p></dd>
<dt><code>set debug overload</code></dt>
<dd><a name="index-C_002b_002b-overload-debugging-info"></a>
<p>Turns on or off display of <small>GDB</small> C<tt>++</tt> overload debugging
info. This includes info such as ranking of functions, etc.  The default
is off.
</p></dd>
<dt><code>show debug overload</code></dt>
<dd><p>Displays the current state of displaying <small>GDB</small> C<tt>++</tt> overload
debugging info.
<a name="index-expression-parser_002c-debugging-info"></a>
<a name="index-debug-expression-parser"></a>
</p></dd>
<dt><code>set debug parser</code></dt>
<dd><p>Turns on or off the display of expression parser debugging output.
Internally, this sets the <code>yydebug</code> variable in the expression
parser.  See <a href="http://www.gnu.org/software/bison/manual/html_node/Tracing.html#Tracing">Tracing Your Parser</a> in <cite>Bison</cite>, for
details.  The default is off.
</p></dd>
<dt><code>show debug parser</code></dt>
<dd><p>Show the current state of expression parser debugging.
<a name="index-packets_002c-reporting-on-stdout"></a>
<a name="index-serial-connections_002c-debugging"></a>
<a name="index-debug-remote-protocol"></a>
<a name="index-remote-protocol-debugging"></a>
<a name="index-display-remote-packets"></a>
</p></dd>
<dt><code>set debug remote</code></dt>
<dd><p>Turns on or off display of reports on all packets sent back and forth across
the serial line to the remote machine.  The info is printed on the
<small>GDB</small> standard output stream. The default is off.
</p></dd>
<dt><code>show debug remote</code></dt>
<dd><p>Displays the state of display of remote packets.
</p></dd>
<dt><code>set debug serial</code></dt>
<dd><p>Turns on or off display of <small>GDB</small> serial debugging info. The
default is off.
</p></dd>
<dt><code>show debug serial</code></dt>
<dd><p>Displays the current state of displaying <small>GDB</small> serial debugging
info.
</p></dd>
<dt><code>set debug solib-frv</code></dt>
<dd><a name="index-FR_002dV-shared_002dlibrary-debugging"></a>
<p>Turn on or off debugging messages for FR-V shared-library code.
</p></dd>
<dt><code>show debug solib-frv</code></dt>
<dd><p>Display the current state of FR-V shared-library code debugging
messages.
</p></dd>
<dt><code>set debug symbol-lookup</code></dt>
<dd><a name="index-symbol-lookup"></a>
<p>Turns on or off display of debugging messages related to symbol lookup.
The default is 0 (off).
A value of 1 provides basic information.
A value greater than 1 provides more verbose information.
</p></dd>
<dt><code>show debug symbol-lookup</code></dt>
<dd><p>Show the current state of symbol lookup debugging messages.
</p></dd>
<dt><code>set debug symfile</code></dt>
<dd><a name="index-symbol-file-functions"></a>
<p>Turns on or off display of debugging messages related to symbol file functions.
The default is off.  See <a href="Files.html#Files">Files</a>.
</p></dd>
<dt><code>show debug symfile</code></dt>
<dd><p>Show the current state of symbol file debugging messages.
</p></dd>
<dt><code>set debug symtab-create</code></dt>
<dd><a name="index-symbol-table-creation"></a>
<p>Turns on or off display of debugging messages related to symbol table creation.
The default is 0 (off).
A value of 1 provides basic information.
A value greater than 1 provides more verbose information.
</p></dd>
<dt><code>show debug symtab-create</code></dt>
<dd><p>Show the current state of symbol table creation debugging.
</p></dd>
<dt><code>set debug target</code></dt>
<dd><a name="index-target-debugging-info"></a>
<p>Turns on or off display of <small>GDB</small> target debugging info. This info
includes what is going on at the target level of GDB, as it happens. The
default is 0.  Set it to 1 to track events, and to 2 to also track the
value of large memory transfers.
</p></dd>
<dt><code>show debug target</code></dt>
<dd><p>Displays the current state of displaying <small>GDB</small> target debugging
info.
</p></dd>
<dt><code>set debug timestamp</code></dt>
<dd><a name="index-timestampping-debugging-info"></a>
<p>Turns on or off display of timestamps with <small>GDB</small> debugging info.
When enabled, seconds and microseconds are displayed before each debugging
message.
</p></dd>
<dt><code>show debug timestamp</code></dt>
<dd><p>Displays the current state of displaying timestamps with <small>GDB</small>
debugging info.
</p></dd>
<dt><code>set debug varobj</code></dt>
<dd><a name="index-variable-object-debugging-info"></a>
<p>Turns on or off display of <small>GDB</small> variable object debugging
info. The default is off.
</p></dd>
<dt><code>show debug varobj</code></dt>
<dd><p>Displays the current state of displaying <small>GDB</small> variable object
debugging info.
</p></dd>
<dt><code>set debug xml</code></dt>
<dd><a name="index-XML-parser-debugging"></a>
<p>Turn on or off debugging messages for built-in XML parsers.
</p></dd>
<dt><code>show debug xml</code></dt>
<dd><p>Displays the current state of XML debugging messages.
</p></dd>
</dl>

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